单项选择题

Now that we have succeeded in isolating this drug, our next problem is to plan its in the laboratory.

A．diagnosis
B．synthesis
C．thesis
D．hypothesis
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单项选择题
Many feared that the continuing insecurity would ______ the chances of elections being held successfully.
A．aggravate
B．jeopardize
C．manipulate
D．deteriorate
单项选择题
The President has again ______ with Congress over his budget plans.
A．bumped
B．collided
C．crashed
D．struck
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